Description: Aim and Pump. The only thing this new kind of gun will do is make your dick bigger and give you a better sex life. He/She will never be happier with the results. Just slip it on and start pulling the trigger. It will get bigger and bigger! The tube is 23 inches, the pump cylinder is 8 inches, the sheath inside the cylinder is 7½ inches, and the circumference if about 7 inches.